Forging machine for coal-cutter picks



March 30,1926.

J. DITSON FOHGING: MACHINE F OR COAL CUTTER PICKS:

Filed Sept. 26. 1925 [NVENTORQ zfisseflfmn H15 ATi'O EY'.

III

reamed Mar. 192a 1 Waste UNITED? STATES rArsurorrics;

JESSE DITSON, OF LITTLETON, COLORADO, ASSIGNOR TO INGERSOIiL-RAND COMPANY, OF JERSEY CITY, NEW JERSEY, A CORPORATIONOE NEW JERSEY.

roneme ivinomnn r03 COAL-CUTTER PICKS.

Application filed- September 26, 1925. Serial No. 58,722.

To all whom it may concern: 4 Be it known that I, J nssn DrrsoN, a c1t1-' Zen of the United States, and resident of Littleton,' in'the county of r-irapahoe and State of Colorado, have yin-vented certain Forging Machines for Coal-Cutter Picks, of

which the following is a specification accomof the stock to slip out from between the dies during the forging operation. This is particularly therase in tools having a tapered bit which requires the forming faces of the dles to be set at anangle to each-- other and which angle corresponds to the desired angle of the bit. It has been found, 7

however, that by means of asuitable automatic clamping device the pick or other article to be forged may beheld firmly in position and that by so doing the bit of the tool may be drawn out to a thin edge or point. v

The objects of'the lnvention are to prevent slipping of the coal pick from between the forging dies during the forging operation and to enable the bit of the coal pickto be-drawn out to a thin edge or point and to automatically release the pick or other article to be forged after the forging operation is completed. 1

Other objects will be in part obvious and in part pointed out hereinafterQ The invention consists of the combinations of elements, features of construction and arrangement of parts havingthe general mode of operation substantially as hereinafter described and more particularlypointed out 111 the appended claimsand illustrated in the accompanying drawings,

' in which- -.e. is hown embodied i a drill sharpener having 'across'head A and a main cylinder B. In this instance the cross head is adapted to reciprocate withrespect tothe main cylinder B and has .a recess C extend ing along one side to receive a top die holderl), which is held in position by means of a top clampingplate E secured;

to the cross head by means of screws F. Siinilarlythe main cylinder B is recessed as at G to receive a bottom die holder H which in this instance has an outwardly extending projection J and is held in position by av bottom clamping plate K, which like the clamping plate E, is also secured: in position by means of screws F. A bottom forming die L is secured to the'bottom die holder H" and held in position by a screwO. A somewhat similar top forming die v?=is inserted in a recess Q of a top'dieholder and like the bottom die L is also held securely in position by the screw 0.; The .dies L and Means are provided for preventing the 7 pick S'to be forced outwardly from betweenv the dies when the top dieP descends upon said pick. To this end an eccentric meniber U is mounted on the projection J of the bot-tom die holder Hand is secured to said projection by means of a pivot V. The pivot V- may be of any suitable fornn but in this instance is .in the form of a bolt extending through the member and through the pro-jection'J. The eccentric member U has aserrated-engaging surface W which is so formed with respect to j the pivotalpoint of the member U that when the top die descends, the serrated surface VViwill firmly grip the shank of the pick S i In order to manipulate the eccentric menr ber U either manually or automatically, a lifter X projects through a recess Y in the top clamping plate E and has a hook portion Z pivotally engaging the eccentric member U, A collar 6 is formed on the lifter I X near the hook portion Z and forms aseat for a compression spring 0 arranged about Sald lift r. The recess 531. c s m hatlarger diameter than the outside diameter of the spring so that, when the cross head A is raised, the spring 0 may remain upon the collar 5. In orderto form an abutment for the opposite or upper end of the spring 0, the recess Y is reduced for a portion or its length to form a shoulder Id against which the spring 0 maybearwhen the cross head A descends. The free end ot the lifter X is preferably screw threaded to receive a not 6 against which the top face of the top clampingp-late E may strike for automatically rocking the eccentric U into re leasing position whenthe'cross head A is raisedy The lifter X is preferably of sui licient length to permit reciprocation of the cross head A: within certain limits without rocking the eccentric member I] about its pivot. If desired the eccentric'member U may he rocked manually by raising the lifter X.

, For further forming operations of-the bit v R, a bottom forming" blockmay be arranged in'the recess G and an opposed to-p forming block 9 mayv be inserted in there. cess C. The blocks f and g are'pre'terably held in position bylclampin'g plateslli which a like the clampingplates E and ,K are held.

firmly in position by screws F. v

" In the operation'ozt" the device assuming that the stock fort-he pick S is about toibe placed in position between the dies L and P and that the eccentric is held in the: re-

leased posit-ion heretofore described, the cross head A may thenbe lowered to-forin the hit 11-. Immediately after the beginning of the downward stroke of the cross head A, the lifter'X willbe released: anddue' to its 'own weight and that of the eccentric member U will cause the eccentric member to drop to the retainingposition shown in Figure 1. As the cross head descends and immediately prior tothe blow of the die P" upon the bit It, the shoulder (Z of the recess .Y will bear against' the spring 0 and thus transmit pressure through said spring upon the collar 5 oft-he lift-er X and force the eccentric'member U more firn'ily into engaging position upon the shank of the picks.

means of this device the p ck S will be held firmlyagainst outward movement.

The force of thet'dies acting against the bit will: cause the eccentric to grip the pick an eccentric member pivoted onthe bottom die holder :f-oJ: clamping'a' pickiimniovably on the bottonrd'ie, anda lifter controlled by the cross head for holding the eccentric member in clamping positionand for rocking' the-eccentric member to releasing position.

2. In a machine for forging a pick, the

combinationof a stationary main cylinder with a reciprocatory cross head, atop die holder on the cross, head, a top lorn'iing die carried by said die holder, a bottom die holder secured to the main cylinder, a bot- 5 tomdie secured to the bottomdi'e holder,

an eccentric member pivoted-on the'b-ottoin die holder for clamping a pick against the bottom die, saidecc-entric having a' serrated engaging surface, and a'liftcr pivotal-1y member .and' con' cured to the eccentric trolled by the cross head for holding eccentric ,me'mber inlclamping position for rocking said member tolreleasing sition'- Q I In a machine for forging a l pick, the combination of a. stationary mailrcyli nder the with a reciprocatory cross head a top die holder on the cross head, a top forming die carried by saidd-ie' holder, a bottom die holder secured to the main cylinder, abot tom die secured to the bottom ,di'e'ho lder at an oblique angle to the top die, an eccentric member mounted pi'i otally' on the bottom "die holder and havingya serrated engaging surface forpreventing removal of a pick from the bottom die, ali tter con-' trolled by tl-iecross'head for holding the eccentric member in engaging position, and'a spring for transmitting pressure from the cross head for holding said. member incugag-ing PQSlhIODf a P l a In testimony whereor Ihave signed this specification.

JESSE .niTsoN, 

